Accessing lateral wellbores in a multilateral well

Abstract

A wellbore whipstock tool assembly includes a body that includes an uphole axial surface that is slanted from one portion of an edge of the uphole axial surface to another portion of the edge of the uphole axial surface, a downhole axial surface opposite the uphole axial surface, and a radial surface between the uphole axial surface and the downhole axial surface; one or more keys formed on the radial surface and configured to secure into one or more keyholes formed in a casing of a wellbore; and a bore that extends between an opening in the uphole axial surface and an opening in the downhole axial surface, the bore sized to receive a bottom hole assembly of an intervention tool.

What is claimed is: 
     
       1. A wellbore intervention system, comprising:
 a first whipstock configured to run into a wellbore formed from a terranean surface to one or more subterranean formations, the first whipstock comprising:
 a first bore of a first diameter that extends from an uphole, angled face of the first whipstock to a downhole face of the first whipstock, and 
 one or more first keys formed on a radial exterior surface of the first whipstock and configured to secure into one or more first keyholes formed in a casing that is secured in the wellbore to position the first whipstock adjacent a first lateral formed from a first lateral window in the casing; 
 
 a second whipstock configured to run into the wellbore formed from the terranean surface to the one or more subterranean formations, the second whipstock comprising:
 a second bore of a second diameter that extends from an uphole, angled face of the second whipstock to a downhole face of the second whipstock, where the first diameter is the same or substantially the same as the second diameter, and 
 one or more second keys formed on a radial exterior surface of the second whipstock and configured to secure into one or more second keyholes formed in the casing to position the second whipstock adjacent a second lateral formed from a second lateral window in the casing; 
 
 an intervention tool configured to selectively pass through one or both of the first or second bores and enter at least one of the first lateral, the second lateral, or another lateral downhole of the first and second laterals; and 
 an adjustable entry tool configured to adjust between a closed position to pass into the first bore and prevent passage of the intervention tool through the first bore, and an open position, based on a signal from the terranean surface, to allow passage of the intervention tool through the first bore while the entry tool is positioned in the first bore. 
 
     
     
       2. The wellbore intervention system of  claim 1 , wherein the one or more first keys comprise a first geometric configuration unique to the one or more first keyholes, and the one or more second keys comprise a second geometric configuration unique to the one or more second keyholes. 
     
     
       3. The wellbore intervention system of  claim 2 , wherein the intervention tool is configured to perform one or more well intervention operations in the first lateral, the second lateral, or the another lateral downhole of the first and second laterals after passing through at least one of the first or second bores. 
     
     
       4. The wellbore intervention system of  claim 1 , wherein the first diameter is less than the second diameter, and the second lateral window is uphole of the first lateral window. 
     
     
       5. The wellbore intervention system of  claim 1 , wherein the one or more first keys are positioned on the first whipstock to engage the one or more first keyholes to orient the uphole, angled face of the first whipstock angularly downward toward the first lateral window, and the one or more second keys are positioned on the second whipstock to engage the one or more second keyholes to orient the uphole, angled face of the second whipstock angularly downward toward the second lateral window. 
     
     
       6. The wellbore intervention system of  claim 1 , further comprising:
 a retrievable plug configured to position within at least a portion of the first bore and flush with the uphole, angled face of the first whipstock to fluidly separate a portion of the wellbore uphole of the first whipstock from a portion of the wellbore downhole of the first whipstock. 
 
     
     
       7. The wellbore intervention system of  claim 1 , further comprising:
 a retrievable entry guide configured to position within at least a portion of the first bore, the guide comprising a funnel or conical shape to guide a bottom hole assembly of the intervention tool into the first bore. 
 
     
     
       8. The wellbore intervention system of  claim 1 , wherein the first whipstock further comprises one or more magnets positioned at or adjacent the uphole, angled face of the first whipstock, the one or more magnets configured to attract a bottom hole assembly of the intervention tool toward an uphole side of the uphole, angled face of the first whipstock such that the bottom hole assembly of the intervention tool can slide into the first bore from the uphole side of the uphole, angled face of the first whipstock based on a setting down weight of a workstring on the intervention tool. 
     
     
       9. The wellbore intervention system of  claim 1 , wherein the first whipstock further comprises one or more magnets positioned within a body of the first whipstock adjacent or near the first bore, the one or more magnets configured to attract a bottom hole assembly of the intervention tool toward and through the first bore. 
     
     
       10. The wellbore intervention system of  claim 1 , wherein the first whipstock further comprises at least one sensor configured to detect the intervention tool passing through the first bore. 
     
     
       11. The wellbore intervention system of  claim 1 , wherein the intervention tool is configured to perform one or more well intervention operations in the first lateral, the second lateral, or the another lateral downhole of the first and second laterals after passing through at least one of the first or second bores. 
     
     
       12. A well intervention method, comprising:
 running a first whipstock into a wellbore formed from a terranean surface to one or more subterranean formations, the first whipstock comprising a first bore of a first diameter that extends from an uphole, angled face of the first whipstock to a downhole face of the first whipstock; 
 securing the first whipstock into a casing installed in the wellbore by securing one or more first keys formed on a radial exterior surface of the first whipstock into one or more first keyholes formed in the casing; 
 based on the securing, positioning the first whipstock adjacent a first lateral formed from a first lateral window in the casing; 
 running a second whipstock into the wellbore, the second whipstock comprising a second bore of a second diameter that extends from an uphole, angled face of the second whipstock to a downhole face of the second whipstock, where the first diameter is the same or substantially the same as the second diameter; 
 securing the second whipstock into the casing by securing one or more second keys formed on a radial exterior surface of the second whipstock into one or more second keyholes formed in the casing; 
 based on the securing, positioning the second whipstock adjacent a second lateral formed from a second lateral window in the casing; and 
 running an adjustable entry tool into the wellbore in a closed position; 
 positioning the adjustable entry tool in the first bore; 
 adjusting the adjustable entry tool from the closed position to an open position; 
 running an intervention tool through the first bore and into the second lateral through the second lateral window; 
 selectively passing the intervention tool run into the wellbore through one or both of the first or second bores; and 
 running the intervention tool into at least one of the first lateral, the second lateral, or another lateral downhole of the first and second laterals subsequent to selectively passing the intervention tool through the one or both of the first or second bores. 
 
     
     
       13. The method of  claim 12 , wherein the one or more first keys comprise a first geometric configuration unique to the one or more first keyholes, and the one or more second keys comprise a second geometric configuration unique to the one or more second keyholes. 
     
     
       14. The method of  claim 13 , further comprising performing one or more well intervention operations in the first lateral, the second lateral, or the another lateral downhole of the first and second laterals with the intervention tool after passing through at least one of the first or second bores. 
     
     
       15. The method of  claim 12 , wherein the first diameter is larger than the second diameter, and the second lateral window is downhole of the first lateral window. 
     
     
       16. The method of  claim 12 , further comprising:
 engaging the one or more first keys with the one or more first keyholes to orient the uphole, angled face of the first whipstock angularly downward toward the first lateral window; and 
 engaging the one or more second keys with the one or more second keyholes to orient the uphole, angled face of the second whipstock angularly downward toward the first lateral window. 
 
     
     
       17. The method of  claim 12 , further comprising:
 positioning a retrievable plug within at least a portion of the first bore and flush with the uphole, angled face of the first whipstock; 
 fluidly separating a portion of the wellbore uphole of the first whipstock from a portion of the wellbore downhole of the first whipstock through the first bore with the retrievable plug positioned within the portion of the first bore; and 
 subsequent to positioning the retrievable plug, running the intervention tool into the first lateral from the first lateral window. 
 
     
     
       18. The method of  claim 12 , further comprising:
 positioning a retrievable entry guide within at least a portion of the first bore; and 
 guiding, with the retrievable entry guide positioned in the portion of the first bore, a bottom hole assembly of the intervention tool into the first bore. 
 
     
     
       19. The method of  claim 12 , further comprising:
 attracting a bottom hole assembly of the intervention tool toward an uphole side of the uphole, angled face of the first whipstock with one or more magnets positioned at or adjacent the uphole, angled face of the first whipstock; 
 setting down weight on the intervention tool with a workstring; and 
 based on the weight, sliding the intervention tool into the first bore from an uphole side of the uphole, angled face of the first whipstock. 
 
     
     
       20. The method of  claim 12 , further comprising:
 attracting a bottom hole assembly of the intervention tool toward and through the first bore with one or more magnets positioned within a body of the first whipstock adjacent or near the first bore. 
 
     
     
       21. The method of  claim 12 , further comprising detecting the intervention tool passing through the first bore of the first whipstock with at least one sensor positioned in the first whipstock. 
     
     
       22. The method of  claim 12 , further comprising performing one or more well intervention operations in the first lateral, the second lateral, or the another lateral downhole of the first and second laterals with the intervention tool after passing through at least one of the first or second bores. 
     
     
       23. A wellbore whipstock tool assembly, comprising:
 a body that comprises:
 an uphole axial surface that is slanted from one portion of an edge of the uphole axial surface to another portion of the edge of the uphole axial surface, 
 a downhole axial surface opposite the uphole axial surface, and 
 a radial surface between the uphole axial surface and the downhole axial surface; 
 
 one or more keys formed on the radial surface and configured to secure into one or more keyholes formed in a casing of a wellbore; 
 a bore that extends between an opening in the uphole axial surface and an opening in the downhole axial surface, the bore sized to receive a bottom hole assembly of an intervention tool; and 
 an adjustable entry tool configured to adjust between a closed position to pass into the bore and prevent passage of an intervention tool through the bore, and an open position, based on a signal from the terranean surface, to allow passage of the intervention tool through the bore while the entry tool is positioned in the bore. 
 
     
     
       24. The wellbore whipstock tool assembly of  claim 23 , wherein the one or more keys are configured to uniquely fit within the one or more keyholes. 
     
     
       25. The wellbore whipstock tool assembly of  claim 23 , wherein the one or more keys are positioned on the radial surface to engage the one or more keyholes to orient the body such that the portion of the edge of the uphole axial surface is uphole of the another portion of the edge of the uphole axial surface, and the another portion of the edge of the uphole axial surface is adjacent to a lateral window of the casing. 
     
     
       26. The wellbore whipstock tool assembly of  claim 23 , further comprising:
 a retrievable plug configured to position within at least a portion of the bore and flush with the uphole axial surface. 
 
     
     
       27. The wellbore whipstock tool assembly of  claim 23 , further comprising:
 a retrievable entry guide configured to position within at least a portion of the bore, the guide comprising a funnel or conical shape to guide a bottom hole assembly of the intervention tool into the bore. 
 
     
     
       28. The wellbore whipstock tool assembly of  claim 23 , further comprising one or more magnets positioned at or adjacent the uphole axial surface of the body, the one or more magnets configured to attract a bottom hole assembly of the intervention tool toward the portion of the edge of the uphole axial surface. 
     
     
       29. The wellbore whipstock tool assembly of  claim 23 , further comprising one or more magnets positioned within the body adjacent or near the bore, the one or more magnets configured to attract a bottom hole assembly of the intervention tool toward and through the bore. 
     
     
       30. The wellbore whipstock tool assembly of  claim 23 , further comprising at least one sensor positioned in the body and configured to detect the intervention tool passing through the bore.